new plus button

lib/services/backup_format.dart

@@ -3,7 +3,7 @@ library;
 
 import 'dart:convert';
 
-const int kBackupVersion = 2;
+const int kBackupVersion = 3;
 
 class BackupDocument {
   const BackupDocument({
@@ -17,6 +17,7 @@ class BackupDocument {
     required this.shoppingLists,
     required this.shoppingListItems,
     required this.images,
+    this.shopTags = const [],
   });
 
   final int version;
@@ -26,6 +27,7 @@ class BackupDocument {
   final List<Map<String, Object?>> products;
   final List<Map<String, Object?>> shops;
   final List<Map<String, Object?>> shopItems;
+  final List<Map<String, Object?>> shopTags;
   final List<Map<String, Object?>> shoppingLists;
   final List<Map<String, Object?>> shoppingListItems;
   final Map<String, String> images;
@@ -39,6 +41,7 @@ class BackupDocument {
     'products': products,
     'shops': shops,
     'shopItems': shopItems,
+    'shopTags': shopTags,
     'shoppingLists': shoppingLists,
     'shoppingListItems': shoppingListItems,
     'images': images,
@@ -66,6 +69,7 @@ class BackupDocument {
       products: _maps(decoded['products']),
       shops: _maps(decoded['shops']),
       shopItems: _maps(decoded['shopItems']),
+      shopTags: _maps(decoded['shopTags']),
       shoppingLists: _maps(decoded['shoppingLists']),
       shoppingListItems: _maps(decoded['shoppingListItems']),
       images: _strings(decoded['images']),